Power transmitting means



July 1, 1941. J. H. SHARP 2,247,670

POWER TRANSMITTING MEANS Filed April 17. 14o

Patented July 1, 1941 warren srarsstarsnr orelcr.

POWER. TRAN SIYQTTING MEANS J 01111 H. Sharp, Chicago, Ill.

Application April 17, 1940, Serial N 0. 339,079

2 Claims.

l This invention relates to power transmitting means, and is particularly adaptable for use in connection with machines wherein power is derived from substantially constant-speed driveshaft, and wherein it is frequently found desirable to change the speed of a driven shait associated with the machine.

Heretofore, it has been customary to use pivoted motor mountings in connection with ordinary change-speed devices, necessitating special parts for machines of different types and sizes to accomplish the desired purpose. Likewise, each particular motor size and setup required individually designed mountings. In the present construction, only one sized device is needed, the parts thereof being interchangeable with the corresponding parts of other similar devices, regardless of the particular machine or machines with which a device is used.

One object, therefore, of the present invention is to provide a device of the kind described, which is universal in character in that it may be utilized on various types and sizes of machines with little alteration, the parts of devices being interchangeablewith one another regardless of the particular types or sizes of the machines on which the devices may be used.

Another object of the invention is to provide a device of novel construction and arrangement wherein the changing of speed and operation of a driven shaft may be readily accomplished and controlled.

Another object of the invention is to provide novel means whereby belt connected shafts having step or cone pulleys thereon may be moved One embodiment of the present invention is shown for illustrative purposes in the accompanying drawing, in which:

Fig. 1 is a side elevational view of my improved machine driving means illustrating the manner of mounting the same on a machine frame;

r Fig. 1.

In the drawing, 5 designates a portion of a machine frame, such, for example, as a lathe, milling machine, or other types of machines, to which the present invention may be applied, and wherein a driven machine shaft 6 is rotatably mounted and intended to be driven at various speeds depending upon the character of work handled by the machine.

The illustrative embodiment of the present invention includes a bracket-like bearing support shown, in the present instance, as comprising a pair of bracket-rods indicated, as a whole and respectively, by the numerals 1 and 8, rigidly secured to the frame 5 by means shown, in the present instance, as nuts 9 mounted on the threaded end portions ID of the bracket-rods and 8, and positioned at opposite sides of portions of the frame 5. v I

The bracket-rods I and 8 extend upwardly and rearwardly from their connection with the machine frame 5 to an elevation adjacent the horizontal plane of the shaft 6 and are provided adjacent their outer ends with portions I I of reduced thickness having apertures I2 formed therein and adapted to receive the respective screwt-hreaded end portions of a spacing rod I3 having stop members I4 mounted thereon for properly spacing the upper end portions of the brackets I and 8 with respect to each other, the stop members being shown, in the present instance, as a pair of threaded nuts adjustably mounted on the threaded portion of the rod I3 and adapted to be secured thereto by means of pins I5 when the stop members have been placed in proper adjusted position.

Pivotally mounted on the rod I3 adjacent the spaced brackets I and 8 are upwardly extending supporting members or arms indicated, as a whole, by the numeral I6 and provided adjacent their lower ends with portions I! of reduced thickness surrounding the rod I3 and providing shoulders I8 adapted to overlie the outer end portions II of the bracket-rods I and 8.

Mounted in the upper end portions of the supporting members I 5 are bearings I9 adapted to receive the outer end portions of a counter-shaft 2I in a manner to rotate therein, the countershaft being provided adjacent one of its end portions with a pulley 22 operatively connected by belts 23 to a pulley 24 mounted on a driving shaft 25 of a motor 26 mounted on the frame 5 of the machine.

Mounted also on the counter-shaft 21 in a manner to rotate therewith is a step pulley 21 operatively connected by a belt 28 to a step pulley 29 mounted on the machine shaft 6 in a manner to rotate the shaft it at various speeds depending upon the portions of the step pulleys 21 and 29 on which the belt 28 is mounted.

For securing'thesupporting members It and the counter-shaft 2| and pulleys mounted thereon in relatively fixed and operative position with respect to the shaft 6 and step pulley 29 mounted thereon, the rod 13 is provided adjacent its outer end portions with nuts 3| by which the upper end It will be observed, also, that the present inand arrangement wherein the changing of speed portions of the brackets 1 and 8 and the'portion's I! of the arm 16 may be securely clamped against the stops 14, thereby securing the step pulley 2-1 in operative position with respect to the step pulley 29 after the belt 28 has been shifted to the'desired or proper position thereon.

It ,will be observed by such an arrangement, thatby' loosening the nuts Slslightly, the arms l6 and counter-shaft 2| with the step pulley 21 mounted thereon may be shifted to the dotted line'po'si'tion shown in 1 and the full line position shown in Fig. 3, thereby producing a slack in the belt 28 to permit shifting of the belt on the step pulleys 21 and "29, after which the arms "1 6, counter-shaft 2-! and step pulley 21 mounted thereon may be "returned to their normal'positionshown by full lines in Fig. 1 and by dotted lines in Fig. 3, thereby tightening the belt 28' toinsure eflicie'nt operation of the driving connection between the counter-shaft 2| and machine-shaft 6. I

I For limiting the movement of the arms 16 in the direction of the machineframe, the outer end portionsof the brackets 1 and Bare each provided with aflatside 32 adapted to be engaged by the shoulder F8 formed *bythe offset portion of the arm it as shown in Fig. 3, and to limit the movement of the arms IS in the opposite direction, 'the cut away portion of the brackets 1 and 8-provides ast'op fac'e 33 adapted to be engaged bya lug 34- formed' adjacent the lower end pormen-er the arms it, as clearly illustrated in Fig'.--3. a

It will be observed from the foregoing description that the present invention provides a novel'device'of the kind described,- which' is-universal' in character and may be employed on various types and sizes of machines with little a1- terati'on; the parts of "devices being interchangeable with o'n'e'another regardless of the particular ty-pesan'd sizes of the machines on which the devices may be used.

and operation of a machine shaft 6 may be readily controlled, and wherein the counter-shaft; 2| may be readily and conveniently shifted to shorten the distance between the centers of the counter-shaft and machine shaft to permit shifting of the belt 28 from one portion of the step pulleys 21 and 29 to other portions thereof.

Also, the present invention provides a device occupying a minimum of space, of improved appearance, economical to manufacture, of simple construction, and efficient in its operation.

Obviously, the present invention i not limited to the precise arrangement and construction shown and described as the same may be variously modified without departing from the spirit and scope of the invention, as set forth in the appended claims.

What I claimas new and desire to secure by Letters Patent 1 In a device of the class describe'dandln combination, a frame, a driving shaft and a driven' shaft mounted thereon, spaced brackets mounted on said frame, said brackets having apertures therein, a rodmountedin said apertures, supporting members pivotally mounted on said. rod adjacent (eachbracket, acounter 'shaft rotatably mounted in saidmembers, pul-l'eyson the respectivefishafts, 'belts operatively related to said pulleys, spacing means :on said rod-for retainingthe upper end portions of said-brackets in relatively fixed relationship, and releasable means. on said rod and 'co'operable with said :spacing means for securing sai'd members. in .fixed position with respect to'sa'i'd brackets.

2. In a devicerof. the. class. described' andzin combination, a frame, a drivin'g shaft and "a driven shaft. mounted thereon, spaced brackets mountedron said frame, sai'd..rbra'ckets. having apertures therein, a rod mountedin said-apertures, a ,pair of spaced shaft ;'suppor-ti-ng ;members pivotally mounted on said ,rod adjacent therespective ends thereof, 'ayoounter-shaft rotatable in said member s, .pulleys on the, respective shafts, belts operatively related to said pulleys, spacing means on said ro'd -for ret'ainin'g the upper end portions of said brackets in relatively fixed, spaced relationship, releasablemeans 1 on said rod and cooperable with-said spacing means for securing said members in fixed position with respect-to said. brackets, and means on said brackets for limiting the niovementwf said suppertingmembers with respect thereto.

:I' :N=H-I RPA 

